[connector:hive] extra_table_metadata fail for Hive partitioned table

[codenamelxl]

Endpoint /superset/extra_table_metadata will fail with 500 when using with partitioned tables for Hive.
User will receive an error message like screenshot in SQL Lab.

Callstack point to error:
AttributeError: 'DataFrame' object has no attribute 'ix'

Expected results

No error should popup

Actual results

500 on the endpoint with partitioned Hive table.

Screenshots

How to reproduce the bug

1. Go to SQL Lab
2. Click on a partitioned table with Hive Database
3. See error

Environment

(please complete the following information):

• superset version: >1.1 (current master)
• python version: 3.7

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

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[codenamelxl]

PR available. Keep this open please.